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A draft design of a combined two-stage ballistic missile was developed at the Yuzhnoye Design Bureau under the leadership of Mikhail Yangel in December 1964. It was assumed that the rocket would be equipped with a first stage with a solid fuel engine and a second ampulized stage equipped with a rocket engine. The missile was placed in a transport and launch container. For the first time for a ground-based missile was worked out mortar launch from a transport and launch container using a powder pressure accumulator. This is the way when which the main engine of the first stage is turned on at height of 20-30 meters above the upper cut of the launcher in order to reduce the destructive effect of the gas jet a running main engine to the starting units. It was envisaged to equip two types of head parts: heavy, with a capacity of 1.5 Mt, and light, with a capacity of 0.5 Mt. The estimated range of a missile with a heavy warhead was 5000 km, and with a light warhead, the intercont
